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紫外强化铜循环催化过硫酸盐降解甲基橙
胡嘉敏,张静,袁琳,林双,等
作者单位地址
胡嘉敏 四川大学建筑与环境学院 四川省成都市四川大学望江校区建筑与环境学院给排水教研室
张静 四川大学建筑与环境学院 四川省成都市武侯区四川大学水电大楼A座514
袁琳 四川大学建筑与环境学院 
林双 四川大学建筑与环境学院 
摘要:
为了增强Cu(II)/PMS体系的氧化能力,加速Cu(I)和Cu(II)间的循环转化,以甲基橙(MO)为目标污染物,研究了Cu(II)/PMS/UV体系氧化降解MO的效果和反应机理,以及UV在Cu(II)/PMS体系中的作用。结果表明:反应20 min时Cu(II)/PMS体系中MO的降解率为41.13%,Cu(II)/PMS/UV体系中MO的降解率达到100.00%;通过投加叔丁醇(TBA)和乙醇(EA)的实验发现,在酸性条件下体系的主要氧化物种是硫酸根自由基(SO4-?)和少量的羟基自由基(HO?);MO的降解率随pH值的增大而减小;提高紫外灯功率和PMS投量均有利于MO的降解;最佳Cu(II)投量为10 umol/L,超过Cu(II)的最佳投量会抑制MO的降解;MO的降解过程符合假一级动力学;紫外可见光谱图分析结果表明MO最终被降解为共轭二烯类物质。研究显示,在Cu(II)/PMS/UV体系中UV可以有效促进Cu(II)向Cu(I)的转化,从而显著增强Cu(II)/PMS体系的氧化能力,有效降解水中污染物。
关键词:  铜循环催化  紫外  过硫酸盐  甲基橙  硫酸根自由基
DOI:
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基金项目:
The Degradation of Methyl Orange via enhancing the Copper-redox Cycle to catalyze Peroxomonosulfate by UV irradiation
HU Jiamin,ZHANG Jing,YUAN Lin,LIN Shuang,et al
Abstract:
In this study, methyl orange (MO) was selected as a target compound for investigating the efficiency and mechanism of MO degradation and the role of UV in the Cu(II)/PMS/UV process with the purpose of enhancing the oxidative capacity of the Cu(II)/PMS process and accelerating the copper-redox cycle. The results indicated that MO was degraded up to 41.13% and 100.00% after 20 min in the Cu(II)/PMS and Cu(II)/PMS/UV processes, respectively. UV could effectively promote the reduction from Cu(II) to Cu(I). The addition of radical scavengers, tert-butyl alcohol (TBA) and ethyl alcohol (EA), inhibited MO degradation, which demonstrated that sulfate radicals (SO4-?) and a small amount of hydroxyl radicals (HO?) were primary oxygen species. MO degradation was decreased with the increased pH level. High power of UV light and dosage of PMS were favorable for the degradation of MO. The optimal dosage of Cu(II) was 10 umol/L, while exceeding this dosage, MO degradation was inhibited. Besides, the degradation of MO followed the pseudo-first-order kinetics. The UV-vis absorption spectra of MO showed that MO was removed to conjugated diene finally. This study revealed that the addition of UV irradiation could strongly enhance the oxidative capacity of Cu(II)/PMS process via accelerating the transformation from Cu(II) to Cu(I), which further removed the contaminants in the aqueous solution.
Key words:  copper-redox cycle  UV  peroxomonosulfate  methyl orange  sulfate radicals